Hello!

I'm using Hibernate 2 in a Java application, which is based on eclipse RCP framework (http://www.eclipse.org/rcp/).

When I run the application from eclipse, everything works fine.

However, when I create a stand-alone application (i. e. a Java application, which runs without eclipse), I'm getting a strange error.

When Configuration is initialized, there is a statement like

configuration.addClass(MyClass.class).

As soon as this stamenent is executed, the application "hangs". I get no error message (last message before the program hangs is "mapping resource from file X.hbm.xml"), no exceptions and nothing happens.

The same application runs without problems, if I execute it from eclipse.

I did following:

1) Verified that the classpaths in the stand-alone application are OK
2) Compared mapping documents, which work and those, which don't and found no differences in their structure. There are two classes, both of which contain only primitive properties. But one of these classes can be configured and the other not.
3) Tried to use configuration.addURL(...) instead of addClass. The mapping document can be read by the class loader, i. e. it is not null.
4) Tried to put all mappings into one XML file (instead of separate mapping file for each class).

None of these measures helped.

Please tell me

a) how I can solve, or, at least,
b) diagnose this problem (see the error, which causes configuration.addClass(...) to hang).

I appreciate any hint.

TIA

Dmitri Pissarenko

Does it ever return? I've seen this happen when the XML parser is unable to resolve the [remote] DTD reference - although I thought that timed out after 30 seconds?

Can you do a thread dump or break into the program in a debugger?

Any Hibernate logs?

Hello!

Thanks for your answer!



No.



I could do it, if the application ran in eclipse. But when it runs in eclipse, this error doesn't occur.



Well, I set show_sql to true and the log4j message level to debug. But this does not help - in addURL(...) method there is only one log.info message at the start ("mapping resource ....hbm.xml").

This message is printed.

Dmitri Pissarenko

Control-Break in the console on Windows, kill -QUIT on Unix will provide a thread dump of a running java program.

I'll try it. Thanks for this hint!

Dmitri

go read about buddy classloading in eclipse since its probably because of some classcastexception or classnotfoundexception that you get an error that for some reasons brings stuff to a halt.

Hello!



Now I tried to press Ctrl-Break after Configuration.addClass(...).

Several stack traces were printed. I conclude that the program is not crashed (at least not all of its threads).

After Configuration.addClass(...) I can still close the dialog box, so the UI is responding.

Best regards

Dmitri

Hello!

Thanks for your hint!



In which version of eclipse does this buddy class loading exist?

TIA

Dmitri Pissarenko

Hello!



I've looked at

http://www.hibernate.org/311.html

and there read



What does Hibernate plugin mean:

a) the plug-in of my application, which uses hibernate, or
b) hibernate packaged as a plug-in

?

TIA

Dmitri Pissarenko

eclipse 3.1

And what can I do if I use eclipse 3.0.x?

TIA

Dmitri

This is more a eclipse RCP classloading issue than it is hibernate related and it has been answered many times on this forum and on eclipse newsgroups.

I recommend you go read about eclipse RCP classloading since that is what is the issue here.

Hello!

Thanks for your help!



Do you think that simply upgrading to eclipse 3.1 can fix the problem?

Is it, in your opinion, necessary to upgrade to a later version of hibernate, too (at the moment I use hibernate 2.1) ?

TIA

Dmitri Pissarenko

as i said, the issue here has nothing to do with hibernate - it has to do with eclipse.

I do not know of any reason why you should not upgrade to eclipse 3.1; its much better than 3.0.

The same goes for Hibernate, if you can then upgrade to the latest version; but it will not help you solve your current problem.

special for rcp development